Polymer-plastics technology and materials, Jun 22, 2022
In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For ... more In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For this purpose, after synthesizing CQDs, they were reacted with acrylic acid to establish covalent bonds and create a C = C bond on the surface of CQDs. Then acrylamide hydrogel was synthesized. In the next step, 1, 3 and 5% UV-curable hydrogel hybrids were prepared. The experimental results displayed that increasing the amount of CQDs in the hydrogel increased photoluminescence intensity and water adsorption while boosting the hydrogel's thermal stability. Besides, increasing the CQDs amount reduces the hydrogel elasticity.
Polymer-plastics technology and materials, Jun 22, 2022
In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For ... more In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For this purpose, after synthesizing CQDs, they were reacted with acrylic acid to establish covalent bonds and create a C = C bond on the surface of CQDs. Then acrylamide hydrogel was synthesized. In the next step, 1, 3 and 5% UV-curable hydrogel hybrids were prepared. The experimental results displayed that increasing the amount of CQDs in the hydrogel increased photoluminescence intensity and water adsorption while boosting the hydrogel's thermal stability. Besides, increasing the CQDs amount reduces the hydrogel elasticity.
Polymer-plastics technology and materials, Jun 22, 2022
In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For ... more In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For this purpose, after synthesizing CQDs, they were reacted with acrylic acid to establish covalent bonds and create a C = C bond on the surface of CQDs. Then acrylamide hydrogel was synthesized. In the next step, 1, 3 and 5% UV-curable hydrogel hybrids were prepared. The experimental results displayed that increasing the amount of CQDs in the hydrogel increased photoluminescence intensity and water adsorption while boosting the hydrogel's thermal stability. Besides, increasing the CQDs amount reduces the hydrogel elasticity.
ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on vario... more ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on various properties of epoxy resins. To do this, graphene quantum dots were synthesized, then, characterized by various spectroscopic methods. These nanoparticles including several weight percentages along with a curing agent were added to epoxy resin. Finally, fluorescent epoxy graphene quantum dots nanocomposites were prepared. FTIR, photoluminescence, UV-visible absorption, FESEM, TGA, tensile testing and DMTA analysis were used to characterize the resultant nanocomposites. Findings evinced that adding graphene quantum dots to the epoxy resin led to an improvement of thermal stability, mechanical features, and viscoelastic properties of nanocomposites. Graphical abstract
ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on vario... more ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on various properties of epoxy resins. To do this, graphene quantum dots were synthesized, then, characterized by various spectroscopic methods. These nanoparticles including several weight percentages along with a curing agent were added to epoxy resin. Finally, fluorescent epoxy graphene quantum dots nanocomposites were prepared. FTIR, photoluminescence, UV-visible absorption, FESEM, TGA, tensile testing and DMTA analysis were used to characterize the resultant nanocomposites. Findings evinced that adding graphene quantum dots to the epoxy resin led to an improvement of thermal stability, mechanical features, and viscoelastic properties of nanocomposites. Graphical abstract
This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum ox... more This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum oxide nanoparticles for preparing thin polymeric heat insulation coatings. In the first step, the nanoparticles were chemically modified with the silane coupling agent. Then, three different weight percent of modified nanoparticles (1, 3, and 5% w/w) were mixed with polyurethane, to prepare the nanocomposites, which were coated on metallic plate samples. Then, these plates are used to measure the radiation heat transfer coefficients, absorption coefficient in a region of short wavelengths (UV/VIS/NIR), the emissivity coefficient, and thermography of the samples in a region of long wavelengths (IR). Results showed that by adding the modified nanoparticles to the polyurethane matrix, absorption was decreased and the emissivity coefficient was increased. According to the thermography results, it was observed that the surface temperature of both samples with 3% w/w of nanoparticles had the min...
This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum ox... more This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum oxide nanoparticles for preparing thin polymeric heat insulation coatings. In the first step, the nanoparticles were chemically modified with the silane coupling agent. Then, three different weight percent of modified nanoparticles (1, 3, and 5% w/w) were mixed with polyurethane, to prepare the nanocomposites, which were coated on metallic plate samples. Then, these plates are used to measure the radiation heat transfer coefficients, absorption coefficient in a region of short wavelengths (UV/VIS/NIR), the emissivity coefficient, and thermography of the samples in a region of long wavelengths (IR). Results showed that by adding the modified nanoparticles to the polyurethane matrix, absorption was decreased and the emissivity coefficient was increased. According to the thermography results, it was observed that the surface temperature of both samples with 3% w/w of nanoparticles had the min...
Polymer-plastics technology and materials, Jun 22, 2022
In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For ... more In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For this purpose, after synthesizing CQDs, they were reacted with acrylic acid to establish covalent bonds and create a C = C bond on the surface of CQDs. Then acrylamide hydrogel was synthesized. In the next step, 1, 3 and 5% UV-curable hydrogel hybrids were prepared. The experimental results displayed that increasing the amount of CQDs in the hydrogel increased photoluminescence intensity and water adsorption while boosting the hydrogel's thermal stability. Besides, increasing the CQDs amount reduces the hydrogel elasticity.
Polymer-plastics technology and materials, Jun 22, 2022
In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For ... more In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For this purpose, after synthesizing CQDs, they were reacted with acrylic acid to establish covalent bonds and create a C = C bond on the surface of CQDs. Then acrylamide hydrogel was synthesized. In the next step, 1, 3 and 5% UV-curable hydrogel hybrids were prepared. The experimental results displayed that increasing the amount of CQDs in the hydrogel increased photoluminescence intensity and water adsorption while boosting the hydrogel's thermal stability. Besides, increasing the CQDs amount reduces the hydrogel elasticity.
Polymer-plastics technology and materials, Jun 22, 2022
In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For ... more In this study, we are going to produce UV-curable hydrogel hybrids with carbon quantum dots. For this purpose, after synthesizing CQDs, they were reacted with acrylic acid to establish covalent bonds and create a C = C bond on the surface of CQDs. Then acrylamide hydrogel was synthesized. In the next step, 1, 3 and 5% UV-curable hydrogel hybrids were prepared. The experimental results displayed that increasing the amount of CQDs in the hydrogel increased photoluminescence intensity and water adsorption while boosting the hydrogel's thermal stability. Besides, increasing the CQDs amount reduces the hydrogel elasticity.
ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on vario... more ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on various properties of epoxy resins. To do this, graphene quantum dots were synthesized, then, characterized by various spectroscopic methods. These nanoparticles including several weight percentages along with a curing agent were added to epoxy resin. Finally, fluorescent epoxy graphene quantum dots nanocomposites were prepared. FTIR, photoluminescence, UV-visible absorption, FESEM, TGA, tensile testing and DMTA analysis were used to characterize the resultant nanocomposites. Findings evinced that adding graphene quantum dots to the epoxy resin led to an improvement of thermal stability, mechanical features, and viscoelastic properties of nanocomposites. Graphical abstract
ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on vario... more ABSTRACT This study aims to investigate the reinforcing effects of graphene quantum dots on various properties of epoxy resins. To do this, graphene quantum dots were synthesized, then, characterized by various spectroscopic methods. These nanoparticles including several weight percentages along with a curing agent were added to epoxy resin. Finally, fluorescent epoxy graphene quantum dots nanocomposites were prepared. FTIR, photoluminescence, UV-visible absorption, FESEM, TGA, tensile testing and DMTA analysis were used to characterize the resultant nanocomposites. Findings evinced that adding graphene quantum dots to the epoxy resin led to an improvement of thermal stability, mechanical features, and viscoelastic properties of nanocomposites. Graphical abstract
This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum ox... more This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum oxide nanoparticles for preparing thin polymeric heat insulation coatings. In the first step, the nanoparticles were chemically modified with the silane coupling agent. Then, three different weight percent of modified nanoparticles (1, 3, and 5% w/w) were mixed with polyurethane, to prepare the nanocomposites, which were coated on metallic plate samples. Then, these plates are used to measure the radiation heat transfer coefficients, absorption coefficient in a region of short wavelengths (UV/VIS/NIR), the emissivity coefficient, and thermography of the samples in a region of long wavelengths (IR). Results showed that by adding the modified nanoparticles to the polyurethane matrix, absorption was decreased and the emissivity coefficient was increased. According to the thermography results, it was observed that the surface temperature of both samples with 3% w/w of nanoparticles had the min...
This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum ox... more This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum oxide nanoparticles for preparing thin polymeric heat insulation coatings. In the first step, the nanoparticles were chemically modified with the silane coupling agent. Then, three different weight percent of modified nanoparticles (1, 3, and 5% w/w) were mixed with polyurethane, to prepare the nanocomposites, which were coated on metallic plate samples. Then, these plates are used to measure the radiation heat transfer coefficients, absorption coefficient in a region of short wavelengths (UV/VIS/NIR), the emissivity coefficient, and thermography of the samples in a region of long wavelengths (IR). Results showed that by adding the modified nanoparticles to the polyurethane matrix, absorption was decreased and the emissivity coefficient was increased. According to the thermography results, it was observed that the surface temperature of both samples with 3% w/w of nanoparticles had the min...
Uploads
Papers by Behzad Shirkavand Hadavand